<template>
    <view class="uni-stat__select">
        <span v-if="label" class="uni-label-text hide-on-phone">{{ label + '：' }}</span>
        <view class="uni-stat-box" :class="{ 'uni-stat__actived': current }">
            <view class="uni-select" :class="{ 'uni-select--disabled': disabled }">
                <view class="uni-select__input-box" @click="toggleSelector">
                    <view v-if="current" class="uni-select__input-text">{{ current }}</view>
                    <view v-else class="uni-select__input-text uni-select__input-placeholder">{{ typePlaceholder }}</view>
                    <uni-icons v-if="current && clear && !disabled" type="clear" color="#c0c4cc" size="24" @click="clearVal" />
                    <uni-icons v-else :type="showSelector ? 'top' : 'bottom'" size="14" color="#999" />
                </view>
                <view class="uni-select--mask" v-if="showSelector" @click="toggleSelector" />
                <view class="uni-select__selector" v-if="showSelector">
                    <view class="uni-popper__arrow"></view>
                    <scroll-view scroll-y="true" class="uni-select__selector-scroll">
                        <view class="uni-select__selector-empty" v-if="mixinDatacomResData.length === 0">
                            <text>{{ emptyTips }}</text>
                        </view>
                        <view
                            v-else
                            class="uni-select__selector-item"
                            v-for="(item, index) in mixinDatacomResData"
                            :key="index"
                            @click="change(item)"
                        >
                            <text :class="{ 'uni-select__selector__disabled': item.disable }">{{ formatItemName(item) }}</text>
                        </view>
                    </scroll-view>
                </view>
            </view>
        </view>
    </view>
</template>

<script>
import Storage from '@/utils/storage'

/**
 * DataChecklist 数据选择器
 * 通过数据渲染的下拉框组件
 * @tutorial https://uniapp.dcloud.io/component/uniui/uni-data-select
 * @property {String} value 默认值
 * @property {Array} localdata 本地数据 ，格式 [{text:'',value:''}]
 * @property {Boolean} clear 是否可以清空已选项
 * @property {Boolean} emptyText 没有数据时显示的文字 ，本地数据无效
 * @property {String} label 左侧标题
 * @property {String} placeholder 输入框的提示文字
 * @property {Boolean} disabled 是否禁用
 * @event {Function} change  选中发生变化触发
 */

export default {
    name: 'uni-stat-select',
    mixins: [uniCloud.mixinDatacom || {}],
    props: {
        localdata: {
            type: Array,
            default() {
                return []
            },
        },
        value: {
            type: [String, Number],
            default: '',
        },
        modelValue: {
            type: [String, Number],
            default: '',
        },
        label: {
            type: String,
            default: '',
        },
        placeholder: {
            type: String,
            default: '请选择',
        },
        emptyTips: {
            type: String,
            default: '无选项',
        },
        clear: {
            type: Boolean,
            default: true,
        },
        defItem: {
            type: Number,
            default: 0,
        },
        disabled: {
            type: Boolean,
            default: false,
        },
        // 格式化输出 用法 field="_id as value, version as text, uni_platform as label" format="{label} - {text}"
        format: {
            type: String,
            default: '',
        },
    },
    data() {
        return {
            showSelector: false,
            current: '',
            mixinDatacomResData: [],
            apps: [],
            channels: [],
            cacheKey: 'uni-data-select-lastSelectedValue',
        }
    },
    created() {
        this.debounceGet = this.debounce(() => {
            this.query()
        }, 300)
        if (this.collection && !this.localdata.length) {
            this.debounceGet()
        }
    },
    computed: {
        typePlaceholder() {
            const text = {
                'opendb-stat-app-versions': '版本',
                'opendb-app-channels': '渠道',
                'opendb-app-list': '应用',
            }
            const common = this.placeholder
            const placeholder = text[this.collection]
            return placeholder ? common + placeholder : common
        },
        valueCom() {
            // #ifdef VUE3
            return this.modelValue
            // #endif
            // #ifndef VUE3
            return this.value
            // #endif
        },
    },
    watch: {
        localdata: {
            immediate: true,
            handler(val, old) {
                if (Array.isArray(val) && old !== val) {
                    this.mixinDatacomResData = val
                }
            },
        },
        valueCom(val, old) {
            this.initDefVal()
        },
        mixinDatacomResData: {
            immediate: true,
            handler(val) {
                if (val.length) {
                    this.initDefVal()
                }
            },
        },
    },
    methods: {
        debounce(fn, time = 100) {
            let timer = null
            return function (...args) {
                if (timer) clearTimeout(timer)
                timer = setTimeout(() => {
                    fn.apply(this, args)
                }, time)
            }
        },
        // 执行数据库查询
        query() {
            this.mixinDatacomEasyGet()
        },
        // 监听查询条件变更事件
        onMixinDatacomPropsChange() {
            if (this.collection) {
                this.debounceGet()
            }
        },
        initDefVal() {
            let defValue = ''
            if ((this.valueCom || this.valueCom === 0) && !this.isDisabled(this.valueCom)) {
                defValue = this.valueCom
            } else {
                let strogeValue
                if (this.collection) {
                    strogeValue = this.getCache()
                }
                if (strogeValue || strogeValue === 0) {
                    defValue = strogeValue
                } else {
                    let defItem = ''
                    if (this.defItem > 0 && this.defItem <= this.mixinDatacomResData.length) {
                        defItem = this.mixinDatacomResData[this.defItem - 1].value
                    }
                    defValue = defItem
                }
                if (defValue || defValue === 0) {
                    this.emit(defValue)
                }
            }
            const def = this.mixinDatacomResData.find((item) => item.value === defValue)
            this.current = def ? this.formatItemName(def) : ''
        },

        /**
         * @param {[String, Number]} value
         * 判断用户给的 value 是否同时为禁用状态
         */
        isDisabled(value) {
            let isDisabled = false

            this.mixinDatacomResData.forEach((item) => {
                if (item.value === value) {
                    isDisabled = item.disable
                }
            })

            return isDisabled
        },

        clearVal() {
            this.emit('')
            if (this.collection) {
                this.removeCache()
            }
        },
        change(item) {
            if (!item.disable) {
                this.showSelector = false
                this.current = this.formatItemName(item)
                this.emit(item.value)
            }
        },
        emit(val) {
            this.$emit('change', val)
            this.$emit('input', val)
            this.$emit('update:modelValue', val)
            if (this.collection) {
                this.setCache(val)
            }
        },
        toggleSelector() {
            if (this.disabled) {
                return
            }

            this.showSelector = !this.showSelector
        },
        formatItemName(item) {
            let { text, value, channel_code } = item
            channel_code = channel_code ? `(${channel_code})` : ''

            if (this.format) {
                // 格式化输出
                let str = ''
                str = this.format
                for (let key in item) {
                    str = str.replace(new RegExp(`{${key}}`, 'g'), item[key])
                }
                return str
            } else {
                return this.collection.indexOf('app-list') > 0 ? `${text}(${value})` : text ? text : `未命名${channel_code}`
            }
        },
        // 获取当前加载的数据
        getLoadData() {
            return this.mixinDatacomResData
        },
        // 获取当前缓存key
        getCurrentCacheKey() {
            return this.collection
        },
        // 获取缓存
        getCache(name = this.getCurrentCacheKey()) {
            let cacheData = Storage.get(this.cacheKey) || {}
            return cacheData[name]
        },
        // 设置缓存
        setCache(value, name = this.getCurrentCacheKey()) {
            let cacheData = Storage.get(this.cacheKey) || {}
            cacheData[name] = value
            Storage.set(this.cacheKey, cacheData)
        },
        // 删除缓存
        removeCache(name = this.getCurrentCacheKey()) {
            let cacheData = Storage.get(this.cacheKey) || {}
            delete cacheData[name]
            Storage.set(this.cacheKey, cacheData)
        },
    },
}
</script>

<style lang="scss">
$uni-base-color: #6a6a6a !default;
$uni-main-color: #333 !default;
$uni-secondary-color: #909399 !default;
$uni-border-3: #e5e5e5;

/* #ifndef APP-NVUE */
@media screen and (max-width: 500px) {
    .hide-on-phone {
        display: none;
    }
}

/* #endif */
.uni-stat__select {
    display: flex;
    align-items: center;
    // padding: 15px;
    cursor: pointer;
    width: 100%;
    flex: 1;
    box-sizing: border-box;
}

.uni-stat-box {
    width: 100%;
    flex: 1;
}

.uni-stat__actived {
    width: 100%;
    flex: 1;
    // outline: 1px solid #2979ff;
}

.uni-label-text {
    font-size: 14px;
    font-weight: bold;
    color: $uni-base-color;
    margin: auto 0;
    margin-right: 5px;
}

.uni-select {
    font-size: 14px;
    border: 1px solid $uni-border-3;
    box-sizing: border-box;
    border-radius: 4px;
    padding: 0 5px;
    padding-left: 10px;
    position: relative;
    /* #ifndef APP-NVUE */
    display: flex;
    user-select: none;
    /* #endif */
    flex-direction: row;
    align-items: center;
    border-bottom: solid 1px $uni-border-3;
    width: 100%;
    flex: 1;
    height: 35px;

    &--disabled {
        background-color: #f5f7fa;
        cursor: not-allowed;
    }
}

.uni-select__label {
    font-size: 16px;
    // line-height: 22px;
    height: 35px;
    padding-right: 10px;
    color: $uni-secondary-color;
}

.uni-select__input-box {
    height: 35px;
    position: relative;
    /* #ifndef APP-NVUE */
    display: flex;
    /* #endif */
    flex: 1;
    flex-direction: row;
    align-items: center;
}

.uni-select__input {
    flex: 1;
    font-size: 14px;
    height: 22px;
    line-height: 22px;
}

.uni-select__input-plac {
    font-size: 14px;
    color: $uni-secondary-color;
}

.uni-select__selector {
    /* #ifndef APP-NVUE */
    box-sizing: border-box;
    /* #endif */
    position: absolute;
    top: calc(100% + 12px);
    left: 0;
    width: 100%;
    background-color: #ffffff;
    border: 1px solid #ebeef5;
    border-radius: 6px;
    box-shadow: 0 2px 12px 0 rgba(0, 0, 0, 0.1);
    z-index: 3;
    padding: 4px 0;
}

.uni-select__selector-scroll {
    /* #ifndef APP-NVUE */
    max-height: 200px;
    box-sizing: border-box;
    /* #endif */
}

.uni-select__selector-empty,
.uni-select__selector-item {
    /* #ifndef APP-NVUE */
    display: flex;
    cursor: pointer;
    /* #endif */
    line-height: 35px;
    font-size: 14px;
    text-align: center;
    /* border-bottom: solid 1px $uni-border-3; */
    padding: 0px 10px;
}

.uni-select__selector-item:hover {
    background-color: #f9f9f9;
}

.uni-select__selector-empty:last-child,
.uni-select__selector-item:last-child {
    /* #ifndef APP-NVUE */
    border-bottom: none;
    /* #endif */
}

.uni-select__selector__disabled {
    opacity: 0.4;
    cursor: default;
}

/* picker 弹出层通用的指示小三角 */
.uni-popper__arrow,
.uni-popper__arrow::after {
    position: absolute;
    display: block;
    width: 0;
    height: 0;
    border-color: transparent;
    border-style: solid;
    border-width: 6px;
}

.uni-popper__arrow {
    filter: drop-shadow(0 2px 12px rgba(0, 0, 0, 0.03));
    top: -6px;
    left: 10%;
    margin-right: 3px;
    border-top-width: 0;
    border-bottom-color: #ebeef5;
}

.uni-popper__arrow::after {
    content: ' ';
    top: 1px;
    margin-left: -6px;
    border-top-width: 0;
    border-bottom-color: #fff;
}

.uni-select__input-text {
    // width: 280px;
    width: 100%;
    color: $uni-main-color;
    white-space: nowrap;
    text-overflow: ellipsis;
    -o-text-overflow: ellipsis;
    overflow: hidden;
}

.uni-select__input-placeholder {
    color: $uni-base-color;
    font-size: 12px;
}

.uni-select--mask {
    position: fixed;
    top: 0;
    bottom: 0;
    right: 0;
    left: 0;
}
</style>
